Novel energy dissipation and shock absorption node for beam column of recombined bamboo frame

Abstract

The utility model provides an energy dissipation and shock absorption node for a beam column of a recombined bamboo frame, belongs to the technical field of civil construction structures, and solves the problems that the research on the connection form of a recombined bamboo component is insufficient, tenons are easy to pull out in the traditional tenon-and-mortise connection mode, and splitting damage is easy to occur in the steel filling plate-bolt connection mode. The joint comprises a recombined bamboo column, a recombined bamboo beam and a special-shaped steel filling plate connecting piece, the joint adopts combined connection of mortise and tenon connection and steel filling plate-bolt connection, the relative displacement of the recombined bamboo column and the recombined bamboo beam is effectively limited to be too large, and joint failure caused by tenon pulling is avoided. The middle layer of the special-shaped steel filler plate connecting piece is a recombined bamboo plate, and splitting damage caused by local extrusion is effectively prevented. The outermost layer is the friction energy dissipation composite rubber sheet, under the earthquake action, the bolts slide relatively through the long circular bolt holes to dissipate energy, and meanwhile the friction energy dissipation composite rubber sheet on the outer surface layer of the connecting piece dissipates energy through friction. The steel filling plate connecting piece is arranged to be in a special shape, so that stress distribution is more reasonable.

Description

Technical Field

[0001] The utility model relates to a novel energy dissipation and shock absorption reorganized bamboo frame beam-column node, comprising a detailed structure and a connection method, and is suitable for connecting reorganized bamboo frame beam-column nodes in construction engineering. Background Art

[0002] In recent years, as the emphasis on ecological protection has gradually increased, the civil engineering industry has also attached more and more importance to the concept of green buildings. Traditional steel structures and concrete structures will produce a large amount of carbon emissions during their entire life cycle. The protection of natural forests has limited the application of wooden structures. Bamboo, as a fast-growing green and environmentally friendly material, has been widely studied and applied. Reconstructed bamboo has excellent physical and mechanical properties such as high strength, good toughness, and good flame retardancy. It is lightweight and high-strength, and has the advantages of being prefabricated and assembled, making it widely used in engineering construction.

[0003] However, in the field of construction engineering, reconstructed bamboo has a short application time, few related studies have been conducted, and the connectors and connection forms between reconstructed bamboo components have not formed relevant specifications. It is difficult to promote and apply reconstructed bamboo frame beam-column nodes on a large scale, especially when applied to high-intensity seismic fortification areas, and the structural details of the nodes need to be considered more. By proposing a connection method for reconstructed bamboo frame beam-column nodes, the advantages of steel and bamboo are combined, and the material properties are fully utilized. It can not only effectively overcome the problems of traditional mortise and tenon connection methods that are prone to tenon pulling and steel filler plate-bolt connection that are prone to splitting damage, but also improve the node's anti-destruction ability and enhance the node's seismic performance. It is of great significance to the promotion and application of reconstructed bamboo structures in high-intensity seismic fortification areas.

[0004] Chinese patent application No. 202320355890.2 discloses a "reconstructed bamboo beam-column node connection structure, including double steel plates arranged on both sides of the reconstructed bamboo column, which are connected together by bolts penetrating the reconstructed bamboo column, and the two steel plates are fixed to the end faces of the reconstructed bamboo beams with bolts. Welding is used at the connection points of the reconstructed bamboo beam-column nodes to connect the steel plates of the reconstructed bamboo beams and columns." The reconstructed bamboo beam-column node connection construction is easy to operate. However, the steel plates of the structure are connected by welding, which has poor plastic toughness, low fatigue strength, and it is difficult to ensure the quality of the welds. The connection area is small and is welded, which has limited improvement on the node strength. In particular, brittle tearing of the welds and the parent material near the welds is prone to occur under strong earthquakes.

[0005] Chinese patent application No. 201320112104.2 discloses a "beam-column node connection of a reconstructed bamboo frame structure. Specifically, there is a steel plate along the side wall of the column, and two parallel steel plates are inserted into the end of the beam in the vertical direction. A steel plate is connected to the metal connector bolts on the parallel reconstructed bamboo side wall at the node connection, and penetrates the reconstructed bamboo column. Bolts are used to penetrate the reconstructed bamboo beam between the two parallel steel plates of the metal connector. The device can transmit force well, and the installation is relatively simple during construction, which is practical and convenient. However, the node device only relies on the bolt hole wall to bear pressure and force on the reconstructed bamboo beam, and two rows of bolts are too close to the edge, which is easy to cause tensile damage to the reconstructed bamboo transverse grain, causing the reconstructed bamboo beam to separate from the metal connector, resulting in node failure, and the device does not consider energy dissipation and shock absorption.

[0006] At present, the beam-column nodes of restructured bamboo frames are mainly connected by steel-filled plate bolts. Under earthquake action, the local extrusion of bamboo by steel plates can easily damage the nodes, and the overall damage of the frame after the earthquake is large. The traditional mortise and tenon joint has a certain ability to absorb and dissipate earthquake energy and has good seismic performance, but the bearing capacity is relatively low. Under strong earthquakes and long-lasting earthquakes, the tenon is prone to pull out and the mortise mouth is squeezed and deformed. The pull-out or excessive deformation of the mortise and tenon joint will cause the node to quickly lose its bearing capacity. Utility Model Content

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] Aiming at the problem that the existing reorganized bamboo frame beam-column node connection method is prone to brittle failure and disengagement of the plate under strong earthquakes, the utility model proposes a steel-bamboo composite node with mortise and tenon joints and steel filler plate bolts in combination with the stress characteristics and failure characteristics of the reorganized bamboo frame node. The connection node includes reorganized bamboo columns, beams and special-shaped steel filler plate connectors pre-processed in the factory, which are transported to the construction site for on-site assembly.

[0009] A square groove and a strip groove are provided in the middle of the reorganized bamboo column, a square one-way straight tenon is provided at the beam end, and a through groove is provided inwardly from one side of the tenon top on some beams and the square one-way straight tenon.

[0010] The special-shaped steel filling plate connecting piece may include three parts according to its shape: a plate head, a plate shoulder and a plate body. The plate head inserted into the reconstructed bamboo column is reserved with two oblong plate head bolt holes, and the plate body inserted into the reconstructed bamboo beam is also provided with a plate body bolt hole IV with the same diameter as the bolt. The plate body bolt hole IV is arranged in 2 rows and 2 columns, with a total of 4 bolt holes. Two oblong plate shoulder bolt holes V are symmetrically arranged above and below the plate shoulder, with a total of 4 holes.

[0011] The special-shaped steel filler plate connector is composed of 1 layer of special-shaped reconstructed bamboo board, 2 layers of special-shaped steel plates and 2 layers of friction energy dissipation composite rubber sheets alternately stacked, wherein the outer surface layer of the special-shaped steel filler plate connector is the friction energy dissipation composite rubber sheet, and the middle layer is the special-shaped reconstructed bamboo board.

[0012] The special-shaped steel filler plate connectors are coated with epoxy resin for bonding, the exposed plate shoulders are coated with epoxy resin for corrosion and rust prevention, and the friction energy dissipation composite rubber sheets on the outer surfaces are fully coated with epoxy resin.

[0013] The plate shoulder bolt hole V and the plate head bolt hole are respectively arranged vertically at 1 / 3 of the distance from the column edge, and the plate body bolt hole IV is also arranged horizontally at 1 / 3 of the distance from the beam height.

[0014] The special-shaped steel filler plate connector is inserted into the reconstructed bamboo column, requiring the head and shoulder of the special-shaped steel filler plate connector to be accurately connected with the groove in the column, and then the reconstructed bamboo beam through groove is accurately connected with the plate body of the special-shaped steel filler plate connector. The reconstructed bamboo column and reconstructed bamboo beam are provided with column bolt holes I, tenon bolt holes III and beam bolt holes II of the same size and position as the head bolt holes, shoulder bolt holes V and plate body bolt holes IV in the special-shaped steel filler plate connector.

[0015] After the reorganized bamboo columns, reorganized bamboo beams and special-shaped steel filler plate connectors are spliced, they are pre-tightened and connected by bolts of a size corresponding to the reserved bolt holes.

[0016] The node bearing capacity of the reorganized bamboo connection method is composed of two parts: (1) the squeezing force and friction force of the mortise and tenon itself, that is, the bearing capacity of the unreinforced mortise and tenon node; and (2) the bearing capacity provided by the mortise and tenon node due to the constraint of the special-shaped steel filler bolts.

[0017] The calculation formula for the bending bearing capacity of the reorganized bamboo node can be expressed as:

[0018] M u =M u1 +M u2

[0019] Where: M u is the bending bearing capacity of the reorganized bamboo node; M u1 M is the bending bearing capacity of the unreinforced mortise and tenon joint; u2 It is the bending bearing capacity borne by the special-shaped steel filler bolts.

[0020] Since the calculation of the bearing capacity of reconstructed bamboo joints is immature and the properties of wood and reconstructed bamboo are similar, according to the calculation of the bearing capacity of the mortise and tenon joints of wooden structures, the calculation formula for the bending bearing capacity of unreinforced mortise and tenon joints is:

[0021]

[0022] Where: θ is the rotation angle of the mortise and tenon joint; K 1K is the influence coefficient of moisture content of reconstituted bamboo; 2 K is the adjustment factor for the tenon opening; 3 An adjustment factor to account for material variations.

[0023] During the process of the node being subjected to force, the position of the instantaneous rotation center is constantly changing, and the node rotates around the instantaneous rotation center until the bearing capacity limit is reached and the instantaneous rotation center stops changing. When force is applied to the node, the position of the instantaneous rotation center changes, and the node rotates around the instantaneous rotation center until the bearing capacity limit is reached and the instantaneous rotation center stops changing. Assume that the geometric center of the bolt group is the origin of the coordinate system, and the coordinates of the instantaneous rotation center are (x 0 ,y 0 ):

[0024]

[0025] Where: N max V is the axial force when the node reaches the ultimate bearing capacity; max F is the shear force when the node reaches the ultimate bearing capacity; i is the resultant force of the ith bolt; r i is the distance from the ith bolt to the instantaneous rotation center.

[0026] The utility model discloses a method for connecting a bamboo frame beam-column joint with a shock-absorbing and energy-dissipating structure, which has the following beneficial effects:

[0027] The construction process is simple and the assembly is convenient. The restructured bamboo beams and columns and the special-shaped steel filler plate connectors are prefabricated in the factory and assembled on the construction site. The nodes are connected with high-strength bolts, which are simple to construct and easy to assemble, effectively shortening the construction period.

[0028] The working performance of the nodes is reliable under strong earthquakes. The mortise and tenon connection is a semi-rigid connection, which dissipates seismic energy through a certain deformation under seismic loads to reduce the seismic response of the structure. The utility model considers the use of bolts to connect the reorganized bamboo beam-column mortise and tenon structure and the special-shaped steel filler plate, giving full play to the collaborative working ability of the two and improving the bending and shear resistance of the nodes. The bolt connection of the steel filler plate limits the excessive relative displacement of the beam and column to avoid node failure caused by tenon pulling. At the same time, reorganized bamboo boards are embedded between the special-shaped steel filler plates for reinforcement, which improves the problem that the bolt nodes of the steel filler plates are prone to splitting and damage under earthquakes due to the low bearing capacity of the transverse grains of bamboo. While ensuring the bearing capacity of the column, the bolt holes on the column should be as close to the inside of the column as possible to prevent the transverse grains of the reorganized bamboo column from being tensilely damaged.

[0029] The structural integrity is good. The reorganized bamboo beam-column and special-shaped steel filler plate connectors are easy to accurately make test pieces and easy to achieve high-quality splicing. The nodes are pre-tightened and connected through high-strength bolts to form an organic whole. The special-shaped steel filler plate connector is designed to exceed the shoulder of the beam and column, and the bolt holes of the plate head, shoulder and body are arranged at the column edge and 1 / 3 of the beam height. It can increase the node connection area and increase the turning force arm. It can provide a certain additional stiffness to the structure, enhance the ability of the node to transmit bending moment, and prevent the tearing damage caused by the cross-grain tension of the column and beam to the maximum extent. The stress distribution is more reasonable. In addition, the exposed shoulder is coated with epoxy resin, which has excellent bonding properties to both steel and wood, and has an anti-corrosion and anti-rust effect on steel. The components can work together to ensure the stability of the structure, enhance the integrity of the structure, and effectively improve the tensile and bending shear resistance at the node.

[0030] Good energy dissipation and shock absorption effect. Compared with only considering the reorganized bamboo steel filler plate bolt connection form, due to the low transverse tensile strength of bamboo, brittle failure of splitting along the grain is prone to occur at the bolt section, the bearing capacity of the reorganized bamboo beam-column node is improved, and the energy dissipation capacity under strong earthquakes is also improved. The utility model adopts a combination of mortise and tenon connection and steel filler plate-bolt connection, and through appropriate construction and reinforcement measures, the force of the combined node is more reasonable. Under the action of an earthquake, the bolts can dissipate part of the energy by sliding relative to the bolt holes of the steel plate. At the same time, the friction energy dissipation composite rubber sheet on the outer surface layer of the connector dissipates energy through sliding friction, and has good energy dissipation capacity.

[0031] The nodes are beautiful in shape and the force transmission system is direct. The nodes are similar to mortise and tenon joints in shape and are beautiful and elegant. The nodes are steel-bamboo composite nodes connected by mortise and tenon joints and steel filler plate bolts. The force transmission system is simple and clear. It is suitable for use in high-quality reconstructed bamboo structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a three-dimensional schematic diagram of the reorganized bamboo frame beam-column node of the utility model;

[0034] Figure 2 It is a three-dimensional split diagram of the beam-column node of the reconstructed bamboo frame of the utility model;

[0035] Figure 3 It is a three-dimensional schematic diagram of the reconstructed bamboo column of the utility model;

[0036] Figure 4 It is a three-dimensional schematic diagram of the reconstructed bamboo beam of the utility model;

[0037] Figure 5 It is a three-dimensional schematic diagram of a node connector of a reorganized bamboo frame beam-column node of the utility model.

[0038] In the figure: 1: reconstructed bamboo column, 1-1: column bolt hole I, 1-2: square groove, 1-3: strip groove; 2: reconstructed bamboo beam, 2-1: beam bolt hole II, 2-2: tenon bolt hole III, 2-3: beam square one-way straight tenon, 2-4 beam through groove; 3: special-shaped steel filling plate connector; 3-1: plate body bolt hole IV, 3-2: plate shoulder bolt hole V, 3-3: plate head bolt hole, 3-4: special-shaped reconstructed bamboo board, 3-5 special-shaped steel plate, 3-6: friction energy dissipation composite rubber sheet, 3-7: plate head, 3-8: plate shoulder, 3-9: plate body. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that if the terms "front", "rear", "up", "down", "left", "right", "vertical", "lateral", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Combine the following Figure 1 to Figure 5 The utility model is described in detail.

[0043] Example

[0044] like Figure 1-5The utility model of the reorganized bamboo frame beam-column node connection method shown in the figure is composed of a reorganized bamboo column 1, a reorganized bamboo beam 2 and a special-shaped steel filler plate connector 3 connected to each other. A reorganized bamboo column square groove 1-2 and a strip groove 1-3 are reserved on the reorganized bamboo column 1, and a reorganized bamboo beam square unidirectional straight tenon 2-3 is set on the reorganized bamboo beam 2. The reorganized bamboo beam 2 and the beam square unidirectional straight tenon 2-3 are provided with a beam through groove 2-4 from one side of the tenon top. The special-shaped steel filler plate connector 3 can be identified as a plate head 3-7, a plate shoulder 3-8 and a plate body 3-9 according to the shape. The plate head 3-7 inserted into the reorganized bamboo column 1 is reserved with two oblong plate head bolt holes 3-3, and a total of four plate body bolt holes IV3-1 are arranged in 2 rows and 2 columns at the corresponding plate body 3-9, and two reserved plate shoulder bolt holes V3-2 are arranged symmetrically at the plate shoulder 3-8, with a total of four arranged.

[0045] Furthermore, one layer of special-shaped reconstructed bamboo board 3-4, two layers of special-shaped steel board 3-5 and two layers of friction energy dissipation composite rubber sheet 3-6 are alternately overlapped to form a special-shaped steel filler plate connector 3, the outer surface layers on both sides are friction energy dissipation composite rubber sheet 3-6, the middle layer is special-shaped reconstructed bamboo board 3-4, and the rest are arranged as special-shaped steel board 3-5. The special-shaped reconstructed bamboo board 3-4 embedded between the special-shaped steel filler plate connectors 3 has a certain improvement on the local pressure bearing performance of the steel filler plate bolt node. Under the action of earthquake, the friction energy dissipation composite rubber sheet 3-6 on the outer surface of the special-shaped steel filler plate connector 3 can dissipate energy through sliding friction. The special-shaped steel filler plate connector 3 is coated with epoxy resin for bonding. The exposed plate shoulder 3-8 is coated with epoxy resin, which has excellent bonding performance to both the special-shaped steel board 3-5 and the special-shaped reconstructed bamboo board 3-4, and has anti-corrosion and anti-rust functions for the special-shaped steel board 3-5 exposed to the air.

[0046] Furthermore, the special-shaped steel filler plate connector 3 is inserted into the reconstructed bamboo column 1, and the plate head 3-7 and plate shoulder 3-8 of the special-shaped steel filler plate connector 3 are accurately connected with the square groove 1-2 in the column, and then the beam through groove 2-4 of the reconstructed bamboo beam 2 is accurately connected with the plate body 3-9 of the special-shaped steel filler plate connector 3. The special-shaped steel filler plate connector 3 is designed to have a plate shoulder 3-8 portion that exceeds the size of the reconstructed bamboo column 1 and the reconstructed bamboo beam 2, which can increase the contact area between the reconstructed bamboo column 1 and the reconstructed bamboo beam 2, increase the additional stiffness between the nodes, enhance the ability of the nodes to transfer bending moments, and prevent the reconstructed bamboo column 1 from shear failure along the grain and the reconstructed bamboo beam 2 from splitting failure across the grain to the greatest extent, so that the stress between the structures is more reasonably distributed. The reorganized bamboo column 1 and the reorganized bamboo beam 2 are both provided with column bolt holes Ⅰ1-1, tenon bolt holes Ⅲ2-2 and beam bolt holes Ⅱ2-1 of the same size and position as the plate head bolt holes 3-3, plate shoulder bolt holes Ⅴ3-2 and plate body bolt holes Ⅳ3-1 in the special-shaped steel filler plate connector 3.

[0047] Furthermore, the shoulder bolt hole V3-2 and the head bolt hole 3-3 are respectively arranged vertically at 1 / 3 of the distance from the column edge, which can reduce the shear failure of the reconstructed bamboo column 1. The body bolt hole IV3-1 is also arranged horizontally at 1 / 3 of the distance from the beam height, which can reduce the transverse splitting failure of the reconstructed bamboo beam 2. After the reconstructed bamboo column 1, the reconstructed bamboo beam 2 and the special-shaped steel filler plate connector 3 are spliced, they are pre-tightened by bolts of the size corresponding to the reserved bolt holes.

[0048] Although the specific implementation methods of the utility model have been described in detail in conjunction with the accompanying drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent. The above are only preferred embodiments of the utility model and are not intended to limit the utility model. For those skilled in the art, the utility model may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A new type of reorganized bamboo frame beam-column energy dissipation and shock absorption node, characterized in that: The invention comprises a reorganized bamboo column (1), a reorganized bamboo beam (2) and a special-shaped steel filler plate connector (3); the plate head (3-7) and the plate shoulder (3-8) of the special-shaped steel filler plate connector are accurately connected with the groove in the column; the beam through groove (2-4) is accurately connected with the plate body (3-9) of the special-shaped steel filler plate connector; the square one-way straight tenon (2-3) of the beam is inserted into the square groove (1-2) of the reorganized bamboo column, and is pre-tightened and connected by high-strength bolts of a size corresponding to the reserved bolt holes.

2. According to claim 1, a new type of reorganized bamboo frame beam-column energy dissipation and shock absorption node is characterized in that: A square groove (1-2) and a strip groove (1-3) are provided in the middle of the reorganized bamboo column (1).

3. The novel reconstructed bamboo frame beam-column energy dissipation and shock absorption node according to claim 1 is characterized in that: The reorganized bamboo beam (2) has a square beam one-way straight tenon at the beam end, and a beam through groove (2-4) is provided inwardly from one side of the tenon top on some beams and the square beam one-way straight tenon (2-3).

4. The novel reconstructed bamboo frame beam-column energy dissipation and shock absorption node according to claim 1 is characterized in that: The middle layer of the special-shaped steel filler plate connector (3) is a special-shaped reconstructed bamboo board (3-4), the number of which is one layer, the surface layer is a friction energy dissipation composite rubber sheet (3-6), the number of which is two layers, and the rest is paved with special-shaped steel plates (3-5), the number of which is two layers.

5. The novel reconstructed bamboo frame beam-column energy dissipation and shock absorption node according to claim 4 is characterized in that: The special-shaped steel filler plate connector (3) can be identified as three parts according to its shape, namely, a plate head (3-7), a plate shoulder (3-8) and a plate body (3-9). The plate head (3-7) inserted into the reorganized bamboo column (1) is reserved with two oblong plate head bolt holes (3-3). The reserved plate body bolt holes IV (3-1) are arranged in two rows and two columns at the corresponding plate body (3-9), with a total of four. Two reserved plate shoulder bolt holes V (3-2) are symmetrically arranged at the plate shoulder (3-8), with a total of four.

6. The novel reconstructed bamboo frame beam-column energy dissipation and shock absorption node according to claim 1 is characterized in that: The reorganized bamboo column (1) and the reorganized bamboo beam (2) are provided with column bolt holes I (1-1), tenon bolt holes III (2-2) and beam bolt holes II (2-1) of the same size and position as the plate head bolt holes (3-3), plate shoulder bolt holes V (3-2) and plate body bolt holes IV (3-1) in the special-shaped steel filler plate connector (3).

7. The novel reconstructed bamboo frame beam-column energy dissipation and shock absorption node according to claim 4 is characterized in that: The special-shaped steel filler plate connector (3) is bonded by coating epoxy resin between layers and epoxy resin is coated on the exposed plate shoulder.

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